Bahá’u’lláh

God hath prescribed unto every one the
duty of teaching His Cause. Whoever ariseth to discharge
this duty, must needs, ere he proclaimeth His
Message, adorn himself with the ornament of an upright
and praiseworthy character, so that his words
may attract the hearts of such as are receptive to his
call. Without it, he can never hope to influence his
hearers.